diff --git a/404.html b/404.html
index a708b68e1..fd9ff205e 100644
--- a/404.html
+++ b/404.html
@@ -1,14 +1,9 @@
 ---
-# The 404 page
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 layout: page
 title: "404: Page not found"
 permalink: /404.html
 
-redirect_from:  # part of site.sitemap_exclude
+redirect_from:
   - /norobots/
   - /assets/
   - /tabs/
@@ -22,4 +17,4 @@ dynamic_title: true
 <div class="lead">
   <p>Sorry, we've misplaced that URL or it's pointing to something that doesn't exist. </p>
   <p><a href="{{ site.baseurl }}/">Head back Home</a> to try finding it again, or search for it on the <a href="{{ site.baseurl }}/tabs/archives">Archives page</a>.</p>
-</div>
\ No newline at end of file
+</div>
diff --git a/_config.yml b/_config.yml
index c0c6961d9..ca93e0e5a 100644
--- a/_config.yml
+++ b/_config.yml
@@ -1,9 +1,4 @@
-# The Site Settings
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT licensed
-
+# The Site Configuration
 
 # jekyll-seo-tag settings › https://github.com/jekyll/jekyll-seo-tag/blob/master/docs/usage.md
 # --------------------------
diff --git a/_data/contact.yml b/_data/contact.yml
index 88f9a6bbd..1cd849644 100644
--- a/_data/contact.yml
+++ b/_data/contact.yml
@@ -1,8 +1,4 @@
 #  The contact options.
-#  v2.3
-#  https://github.com/cotes2020/jekyll-theme-chirpy
-#  © 2020 Cotes Chung
-#  MIT Licensed
 
 -
   type: github
diff --git a/_data/date_format.yml b/_data/date_format.yml
index e10093f9d..3c7bc798d 100644
--- a/_data/date_format.yml
+++ b/_data/date_format.yml
@@ -1,9 +1,4 @@
 #  The date format
-#  v2.1
-#  https://github.com/cotes2020/jekyll-theme-chirpy
-#  © 2020 Cotes Chung
-#  MIT Licensed
-
 
 tooltip: "%a, %b %e, %Y, %l:%M %p %z"
 
diff --git a/_data/label.yml b/_data/label.yml
index f46fd45a1..11cccf426 100644
--- a/_data/label.yml
+++ b/_data/label.yml
@@ -1,8 +1,4 @@
 # The label text of site.
-#  v2.0
-#  https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT Licensed
 
 panel:
   lastmod: Recent Update
diff --git a/_data/meta.yml b/_data/meta.yml
deleted file mode 100644
index 9339064d8..000000000
--- a/_data/meta.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-name: Chirpy
-version: 2.7.2
-homepage: https://github.com/cotes2020/jekyll-theme-chirpy/
diff --git a/_data/rights.yml b/_data/rights.yml
index bedc283d9..f6fdd4284 100644
--- a/_data/rights.yml
+++ b/_data/rights.yml
@@ -1,10 +1,4 @@
-#  License data.
-#
-#  v2.1
-#  https://github.com/cotes2020/jekyll-theme-chirpy
-#  © 2020 Cotes Chung
-#  MIT Licensed
-
+#  License data
 
 license:
   name: CC BY 4.0
@@ -14,4 +8,4 @@ brief: Some rights reserved.
 
 verbose: >-
   Except where otherwise noted, the blog posts on this site are licensed
-  under the Creative Commons Attribution 4.0 International (CC BY 4.0) License by the author.
\ No newline at end of file
+  under the Creative Commons Attribution 4.0 International (CC BY 4.0) License by the author.
diff --git a/_data/share.yml b/_data/share.yml
index 763bb7adf..ecd1b0d8d 100644
--- a/_data/share.yml
+++ b/_data/share.yml
@@ -1,10 +1,5 @@
 #  Sharing options at the bottom of the post.
 #  Icons from <https://fontawesome.com/>
-#
-#  v2.1
-#  https://github.com/cotes2020/jekyll-theme-chirpy
-#  © 2020 Cotes Chung
-#  MIT Licensed
 
 platforms:
   -
diff --git a/_includes/css-selector.html b/_includes/css-selector.html
index 77ee998b2..a333c3b32 100644
--- a/_includes/css-selector.html
+++ b/_includes/css-selector.html
@@ -1,9 +1,5 @@
 <!--
   CSS selector for site.
-  Chirpy v2.3
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT Licensed
 -->
 
 <link rel="stylesheet" href="{{ '/assets/css/style.css' | relative_url }}">
diff --git a/_includes/disqus.html b/_includes/disqus.html
index 7115bf18d..2015c899a 100644
--- a/_includes/disqus.html
+++ b/_includes/disqus.html
@@ -1,10 +1,6 @@
 <!--
   The Disqus lazy loading.
   Powered by: <https://github.com/osvaldasvalutis/disqusLoader.js>
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2019 Cotes Chung
-  MIT License
 -->
 
 <div id="disqus" class="pt-2 pb-2">
diff --git a/_includes/favicons.html b/_includes/favicons.html
index a72cd5317..437c6a115 100644
--- a/_includes/favicons.html
+++ b/_includes/favicons.html
@@ -1,10 +1,6 @@
 <!--
   The Favicons for Web, Android, Microsoft, and iOS (iPhone and iPad) Apps
   Generated by: https://www.favicon-generator.org/
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2019 Cotes Chung
-  Published under the MIT license
 -->
 
 {% capture icon_url %}{{ site.baseurl }}/assets/img/favicons{% endcapture %}
diff --git a/_includes/footer.html b/_includes/footer.html
index b327c3e60..cf8ef91d8 100644
--- a/_includes/footer.html
+++ b/_includes/footer.html
@@ -1,9 +1,5 @@
 <!--
   The Footer
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 
 <footer class="d-flex w-100 justify-content-center">
diff --git a/_includes/google-analytics.html b/_includes/google-analytics.html
index b3972654b..e5e5119e5 100644
--- a/_includes/google-analytics.html
+++ b/_includes/google-analytics.html
@@ -1,9 +1,5 @@
 <!--
   The GA snippet
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 <!-- Global site tag (gtag.js) - Google Analytics -->
 <script defer src="https://www.googletagmanager.com/gtag/js?id={{ site.google_analytics.id }}"></script>
diff --git a/_includes/head.html b/_includes/head.html
index da9b8cdbf..b8f720b7d 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -1,15 +1,10 @@
 <!--
   The Head
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 
 <head>
   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
-  <meta name="theme" content="{{ site.data.meta.name }} v{{ site.data.meta.version }}">
 
   {% if page.layout == 'home' or page.layout == 'post' %}
     <meta name="pv-cache-enabled" content="{{ site.google_analytics.pv.enabled }}">
diff --git a/_includes/js-selector.html b/_includes/js-selector.html
index 4cdd45895..8f7d4ea26 100644
--- a/_includes/js-selector.html
+++ b/_includes/js-selector.html
@@ -1,9 +1,5 @@
 <!--
   JS selector for site.
-  Chirpy v2.3
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT Licensed
 -->
 
 {% if page.layout == 'home' or page.layout == 'post' %}
diff --git a/_includes/lozad.html b/_includes/lozad.html
index 0cb66f4c4..2bc01ad59 100644
--- a/_includes/lozad.html
+++ b/_includes/lozad.html
@@ -1,4 +1,6 @@
-<!-- image lazy load: https://github.com/ApoorvSaxena/lozad.js -->
+<!--
+  image lazy load: https://github.com/ApoorvSaxena/lozad.js
+-->
 <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/lozad/dist/lozad.min.js"></script>
 
 <script type="text/javascript">
diff --git a/_includes/mode-toggle.html b/_includes/mode-toggle.html
index 8d49b287e..4108c8354 100644
--- a/_includes/mode-toggle.html
+++ b/_includes/mode-toggle.html
@@ -1,10 +1,5 @@
 <!--
   Switch the mode between dark and light.
-
-  v2.1
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT License
 -->
 
 <i class="mode-toggle fas fa-adjust"></i>
diff --git a/_includes/no-linenos.html b/_includes/no-linenos.html
index 0b3a1ece5..850069337 100644
--- a/_includes/no-linenos.html
+++ b/_includes/no-linenos.html
@@ -1,9 +1,5 @@
 {% comment %}
   Remove the line number of the code snippet.
-  v2.2
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  Published under the MIT License
 {% endcomment %}
 
 {% assign content = include.content %}
diff --git a/_includes/panel.html b/_includes/panel.html
index 138141763..3b9fb753a 100644
--- a/_includes/panel.html
+++ b/_includes/panel.html
@@ -1,9 +1,5 @@
 <!--
   The Pannel on right side (Desktop views)
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 
 <div id="panel-wrapper" class="col-xl-3 pl-2 text-muted topbar-down">
diff --git a/_includes/post-nav.html b/_includes/post-nav.html
index 6c32aeffb..521b9e526 100644
--- a/_includes/post-nav.html
+++ b/_includes/post-nav.html
@@ -1,10 +1,5 @@
 <!--
   Navigation buttons at the bottom of the post.
-
-  v2.1
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT License
 -->
 
 <div class="post-navigation d-flex justify-content-between">
diff --git a/_includes/post-paginator.html b/_includes/post-paginator.html
index cfc53ec32..484cde893 100644
--- a/_includes/post-paginator.html
+++ b/_includes/post-paginator.html
@@ -1,10 +1,5 @@
 <!--
   The paginator for post list on HomgPage.
-
-  v2.1
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT License
 -->
 
 <ul class="pagination mt-4 mb-0 pl-lg-2">
diff --git a/_includes/post-sharing.html b/_includes/post-sharing.html
index 9998fd484..c95a3073e 100644
--- a/_includes/post-sharing.html
+++ b/_includes/post-sharing.html
@@ -1,10 +1,5 @@
 <!--
  Post sharing snippet
-
- v2.1
- https://github.com/cotes2020/jekyll-theme-chirpy
- © 2019 Cotes Chung
- Published under the MIT License
 -->
 
 <div class="share-wrapper">
diff --git a/_includes/related-posts.html b/_includes/related-posts.html
index 4f2b7c656..be6327977 100644
--- a/_includes/related-posts.html
+++ b/_includes/related-posts.html
@@ -1,11 +1,6 @@
 <!--
  Recommend the other 3 posts according to the tags and categories of the current post,
  if the number is not enough, use the other latest posts to supplement.
-
- v2.0
- https://github.com/cotes2020/jekyll-theme-chirpy
- © 2019 Cotes Chung
- Published under the MIT License
 -->
 
 <!-- The total size of related posts  -->
diff --git a/_includes/search-loader.html b/_includes/search-loader.html
index 1c2565e2c..4a18e6dec 100644
--- a/_includes/search-loader.html
+++ b/_includes/search-loader.html
@@ -1,9 +1,5 @@
 <!--
   Jekyll Simple Search loader
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 
 {% capture result_elem %}
diff --git a/_includes/search-results.html b/_includes/search-results.html
index 698e91a91..af6714495 100644
--- a/_includes/search-results.html
+++ b/_includes/search-results.html
@@ -1,9 +1,5 @@
 <!--
   The Search results
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 <div id="search-result-wrapper" class="d-flex justify-content-center unloaded">
   <div class="col-12 col-xl-11 post-content">
diff --git a/_includes/sidebar.html b/_includes/sidebar.html
index 4d7f5ddde..a6a421b5f 100644
--- a/_includes/sidebar.html
+++ b/_includes/sidebar.html
@@ -1,9 +1,5 @@
 <!--
   The Side Bar
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 
 <div id="sidebar" class="d-flex flex-column align-items-end">
diff --git a/_includes/timeago.html b/_includes/timeago.html
index 908dd7990..3b5851d1f 100644
--- a/_includes/timeago.html
+++ b/_includes/timeago.html
@@ -1,10 +1,5 @@
 <!--
   Date format snippet
-
-  v2.4.1
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT License
 -->
 
 {% assign tooltip_df = site.data.date_format.tooltip | default: '%a, %b %e, %Y, %l:%M %p %z' %}
diff --git a/_includes/topbar.html b/_includes/topbar.html
index 89f3f0bb1..1cf82b0ed 100644
--- a/_includes/topbar.html
+++ b/_includes/topbar.html
@@ -1,10 +1,7 @@
 <!--
   The Top Bar
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
+
 <div id="topbar-wrapper" class="row justify-content-center topbar-down">
   <div id="topbar" class="col-11 d-flex h-100 align-items-center justify-content-between">
     <span id="breadcrumb">
diff --git a/_includes/trending-tags.html b/_includes/trending-tags.html
index f884768e4..05f9c846f 100644
--- a/_includes/trending-tags.html
+++ b/_includes/trending-tags.html
@@ -1,9 +1,5 @@
 {% comment %}
   The trending tags list
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2019 Cotes Chung
-  MIT Licensed
 {% endcomment %}
 
 {% assign MAX = 10 %}
diff --git a/_includes/update-list.html b/_includes/update-list.html
index 328267ad8..8dbf9841a 100644
--- a/_includes/update-list.html
+++ b/_includes/update-list.html
@@ -1,9 +1,5 @@
 {% comment %}
   Get the last 5 posts from lastmod list.
-  v2.2
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT License
 {% endcomment %}
 
 {% assign MAX_SIZE = 5 %}
diff --git a/_layouts/archives.html b/_layouts/archives.html
index ea4f0b54e..090a36f6f 100644
--- a/_layouts/archives.html
+++ b/_layouts/archives.html
@@ -1,11 +1,6 @@
 ---
 layout: page
-
 # The Archives of posts.
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 ---
 
 
diff --git a/_layouts/categories.html b/_layouts/categories.html
index 474f983cb..2ae421df5 100644
--- a/_layouts/categories.html
+++ b/_layouts/categories.html
@@ -1,11 +1,6 @@
 ---
 layout: page
-
 # All the Categories of posts
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 ---
 
 
diff --git a/_layouts/category.html b/_layouts/category.html
index 4382d6ee5..49f4e2fa9 100644
--- a/_layouts/category.html
+++ b/_layouts/category.html
@@ -1,9 +1,6 @@
 ---
 layout: page
 # The Category layout
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# MIT Licensed
 ---
 
 <div id="page-category">
diff --git a/_layouts/default.html b/_layouts/default.html
index 31a4df00d..204847aff 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -1,10 +1,6 @@
 ---
 layout: compress
 # Default layout
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT Licensed
 ---
 
 <!DOCTYPE html>
diff --git a/_layouts/home.html b/_layouts/home.html
index d6de50800..9d77caed6 100644
--- a/_layouts/home.html
+++ b/_layouts/home.html
@@ -1,10 +1,6 @@
 ---
 layout: page
 # The Home page layout
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT Licensed
 ---
 
 
diff --git a/_layouts/page.html b/_layouts/page.html
index 1473f1f62..066faf30a 100644
--- a/_layouts/page.html
+++ b/_layouts/page.html
@@ -1,10 +1,6 @@
 ---
 layout: default
 # The page layout
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 ---
 
 <div class="row">
diff --git a/_layouts/post.html b/_layouts/post.html
index 42dc434ff..0826f3d15 100644
--- a/_layouts/post.html
+++ b/_layouts/post.html
@@ -1,10 +1,6 @@
 ---
 layout: default
 # The posts' layout
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT Licensed
 ---
 
 <div class="row">
diff --git a/_layouts/tag.html b/_layouts/tag.html
index d4fefe93a..af78ae08f 100644
--- a/_layouts/tag.html
+++ b/_layouts/tag.html
@@ -1,10 +1,6 @@
 ---
 layout: page
 # The layout for Tag page
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT Licensed
 ---
 
 
diff --git a/_layouts/tags.html b/_layouts/tags.html
index 9c1923a7c..d0e63d59c 100644
--- a/_layouts/tags.html
+++ b/_layouts/tags.html
@@ -1,11 +1,6 @@
 ---
 layout: page
-
 # All the Tags of posts.
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 ---
 
 <div id="tags" class="d-flex flex-wrap ml-xl-2 mr-xl-2">
diff --git a/_plugins/posts-lastmod-hook.rb b/_plugins/posts-lastmod-hook.rb
index e88d8317f..1fd6ecf9d 100644
--- a/_plugins/posts-lastmod-hook.rb
+++ b/_plugins/posts-lastmod-hook.rb
@@ -1,4 +1,7 @@
+#!/usr/bin/env ruby
+#
 # Check for changed posts
+
 Jekyll::Hooks.register :posts, :post_init do |post|
 
   commit_num = `git rev-list --count HEAD "#{ post.path }"`
diff --git a/_sass/jekyll-theme-chirpy.scss b/_sass/jekyll-theme-chirpy.scss
index e19c756da..5e14b1b13 100644
--- a/_sass/jekyll-theme-chirpy.scss
+++ b/_sass/jekyll-theme-chirpy.scss
@@ -1,8 +1,7 @@
-/*
- * The main styles
+/*!
+ * The styles for Jekyll theme Chirpy
  *
- * v2.7.2
- * https://github.com/cotes2020/jekyll-theme-chirpy
+ * Chirpy v2.7.2 (https://github.com/cotes2020/jekyll-theme-chirpy)
  * © 2021 Cotes Chung
  * MIT Licensed
  */
diff --git a/_tabs/about.md b/_tabs/about.md
index a0b1e3e7f..a28ea050d 100644
--- a/_tabs/about.md
+++ b/_tabs/about.md
@@ -2,12 +2,6 @@
 title: About
 icon: fas fa-info
 order: 4
-
-# The About page
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 ---
 
 
diff --git a/app.js b/app.js
index 9b80e0009..b821164c7 100644
--- a/app.js
+++ b/app.js
@@ -1,12 +1,8 @@
 ---
 layout: compress
-# Chirpy v2.2
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2020 Cotes Chung
-# MIT Licensed
 ---
 
 /* Registering Service Worker */
 if('serviceWorker' in navigator) {
   navigator.serviceWorker.register('{{ "/sw.js" | relative_url }}');
-};
\ No newline at end of file
+};
diff --git a/assets/js/.copyright b/assets/js/.copyright
new file mode 100644
index 000000000..8646dd03c
--- /dev/null
+++ b/assets/js/.copyright
@@ -0,0 +1,5 @@
+/*!
+ * Chirpy v2.7.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * © 2021 Cotes Chung
+ * MIT Licensed
+ */
diff --git a/assets/js/_commons/copy-link.js b/assets/js/_commons/copy-link.js
index fc65d2b19..2d5e99d3f 100644
--- a/assets/js/_commons/copy-link.js
+++ b/assets/js/_commons/copy-link.js
@@ -1,9 +1,5 @@
 /*
  * Copy current page url to clipboard.
- * v2.1
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2020 Cotes Chung
- * MIT License
  */
 
 function copyLink(url) {
diff --git a/assets/js/_commons/search-display.js b/assets/js/_commons/search-display.js
index 4fd29ac39..20bf47495 100644
--- a/assets/js/_commons/search-display.js
+++ b/assets/js/_commons/search-display.js
@@ -1,9 +1,5 @@
 /*
 * This script make #search-result-wrapper switch to unloaded or shown automatically.
-* v2.0
-* https://github.com/cotes2020/jekyll-theme-chirpy
-* © 2018-2019 Cotes Chung
-* MIT License
 */
 
 $(function() {
diff --git a/assets/js/_commons/sidebar.js b/assets/js/_commons/sidebar.js
index 2aca1ed0a..014411a18 100644
--- a/assets/js/_commons/sidebar.js
+++ b/assets/js/_commons/sidebar.js
@@ -1,9 +1,5 @@
 /**
  * Expand or close the sidebar in mobile screens.
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2018-2019 Cotes Chung
- * MIT License
  */
 
 $(function() {
diff --git a/assets/js/_commons/tooltip-loader.js b/assets/js/_commons/tooltip-loader.js
index de6ed9bd9..90c6a98f4 100644
--- a/assets/js/_commons/tooltip-loader.js
+++ b/assets/js/_commons/tooltip-loader.js
@@ -1,9 +1,5 @@
 /**
  * Initial Bootstrap Tooltip.
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2019 Cotes Chung
- * MIT License
 */
 $(function () {
   $("[data-toggle=\"tooltip\"]").tooltip();
diff --git a/assets/js/_commons/topbar-switch.js b/assets/js/_commons/topbar-switch.js
index 2a4d20f61..55fbab6df 100644
--- a/assets/js/_commons/topbar-switch.js
+++ b/assets/js/_commons/topbar-switch.js
@@ -1,9 +1,5 @@
 /*
  * Hide Header on scroll down
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2018-2019 Cotes Chung
- * MIT License
  */
 
 $(function() {
diff --git a/assets/js/_commons/topbar-title.js b/assets/js/_commons/topbar-title.js
index aca3b05e7..6bc780550 100644
--- a/assets/js/_commons/topbar-title.js
+++ b/assets/js/_commons/topbar-title.js
@@ -1,9 +1,5 @@
 /*
  * Top bar title auto change while scrolling in mobile screens.
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2018-2019 Cotes Chung
- * MIT License
 */
 
 $(function() {
diff --git a/assets/js/_utils/category-collapse.js b/assets/js/_utils/category-collapse.js
index d8c8a3da4..904b44812 100644
--- a/assets/js/_utils/category-collapse.js
+++ b/assets/js/_utils/category-collapse.js
@@ -1,9 +1,5 @@
 /*
  * Tab 'Categories' expand/close effect.
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2018-2019 Cotes Chung
- * MIT License
  */
 
 $(function() {
diff --git a/assets/js/_utils/img-hyperlink.js b/assets/js/_utils/img-hyperlink.js
index df38d0593..2722eac33 100644
--- a/assets/js/_utils/img-hyperlink.js
+++ b/assets/js/_utils/img-hyperlink.js
@@ -1,10 +1,5 @@
 /*
  * Find out the <a> tag contains an image and mark it.
- *
- * v2.5.1
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2020 Cotes Chung
- * MIT Licensed
  */
 
 $(function() {
diff --git a/assets/js/_utils/pageviews.js b/assets/js/_utils/pageviews.js
index 4a64c786b..caa68cb81 100644
--- a/assets/js/_utils/pageviews.js
+++ b/assets/js/_utils/pageviews.js
@@ -1,14 +1,9 @@
-/**
+/*
  * Count page views form GA or local cache file.
  *
  * Dependencies:
  *   - jQuery
  *   - countUp.js <https://github.com/inorganik/countUp.js>
- *
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2018-2019 Cotes Chung
- * MIT License
  */
 
 const getInitStatus = (function () {
diff --git a/assets/js/_utils/timeago.js b/assets/js/_utils/timeago.js
index 0e2f49e1e..902cf48d7 100644
--- a/assets/js/_utils/timeago.js
+++ b/assets/js/_utils/timeago.js
@@ -1,9 +1,5 @@
 /*
  * Calculate the Timeago
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2019 Cotes Chung
- * MIT Licensed
  */
 
 $(function() {
diff --git a/assets/js/dist/categories.min.js b/assets/js/dist/categories.min.js
index f84862b83..002fb7b39 100644
--- a/assets/js/dist/categories.min.js
+++ b/assets/js/dist/categories.min.js
@@ -1 +1,6 @@
+/*!
+ * Chirpy v2.7.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * © 2021 Cotes Chung
+ * MIT Licensed
+ */
 function copyLink(e){e&&0!==e.length||(e=window.location.href);const o=$("<input>");$("body").append(o),o.val(e).select(),document.execCommand("copy"),o.remove(),alert("Link copied successfully!")}$(function(){$(window).scroll(()=>{$(this).scrollTop()>50&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$("input[type=checkbox]").addClass("unloaded"),$("input[type=checkbox][checked]").before('<i class="fas fa-check-circle checked"></i>'),$("input[type=checkbox]:not([checked])").before('<i class="far fa-circle"></i>')}),$(function(){const e=$("#sidebar-trigger"),o=$("#search-trigger"),s=$("#search-cancel"),t=$("#search-cleaner"),a=$("#main"),l=$("#topbar-title"),n=$("#search-wrapper"),d=$("#search-result-wrapper"),r=$("#search-results"),c=$("#search-input"),i=$("#search-hints"),f=function(){let e=0;return{block(){e=$(window).scrollTop()},release(){$("html,body").scrollTop(e)},getOffset:()=>e}}(),u={on(){e.addClass("unloaded"),l.addClass("unloaded"),o.addClass("unloaded"),n.addClass("d-flex"),s.addClass("loaded")},off(){s.removeClass("loaded"),n.removeClass("d-flex"),e.removeClass("unloaded"),l.removeClass("unloaded"),o.removeClass("unloaded")}},p=function(){let e=!1;return{on(){e||(d.removeClass("unloaded"),a.addClass("hidden"),e=!0,f.block())},off(){e&&(r.empty(),i.hasClass("unloaded")&&i.removeClass("unloaded"),d.addClass("unloaded"),t.removeClass("visible"),a.removeClass("hidden"),c.val(""),e=!1,f.release())},isVisible:()=>e}}();function h(){return s.hasClass("loaded")}o.click(function(){u.on(),p.on(),c.focus()}),s.click(function(){u.off(),p.off()}),c.focus(function(){n.addClass("input-focus")}),c.focusout(function(){n.removeClass("input-focus")}),c.on("keyup",function(e){8===e.keyCode&&""===c.val()?h()?i.removeClass("unloaded"):p.off():""!==c.val()&&(p.on(),t.hasClass("visible")||t.addClass("visible"),h()&&i.addClass("unloaded"))}),t.on("click",function(){c.val(""),h()?(i.removeClass("unloaded"),r.empty()):p.off(),c.focus(),t.removeClass("visible")})}),$(function(){const e=function(){let e=!1;const o=$("body");return{toggle(){!1===e?o.attr("sidebar-display",""):o.removeAttr("sidebar-display"),e=!e}}}();$("#sidebar-trigger").click(e.toggle),$("#mask").click(e.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const e=$("#topbar-wrapper"),o=$("#toc-wrapper"),s=$(".access"),t=$("#search-input");let a,l=0;const n=5,d=e.outerHeight();$(window).scroll(function(e){$("#topbar-title").is(":hidden")&&(a=!0)}),setInterval(function(){a&&(!function(){var a=$(this).scrollTop();Math.abs(l-a)<=n||(a>l&&a>d?(e.removeClass("topbar-down").addClass("topbar-up"),o.length>0&&o.removeClass("topbar-down"),s.length>0&&s.removeClass("topbar-down"),t.is(":focus")&&t.blur()):a+$(window).height()<$(document).height()&&(e.removeClass("topbar-up").addClass("topbar-down"),o.length>0&&o.addClass("topbar-down"),s.length>0&&s.addClass("topbar-down")),l=a)}(),a=!1)},250)}),$(function(){const e=$("#topbar-title"),o=$("div.post>h1"),s=e.text().trim();let t=o.length>0?o.text().trim():$("h1").text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(t)&&(t=t.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){if($("#post-list").length||o.is(":hidden")||e.is(":hidden")||$("#sidebar.sidebar-expand").length)return!1;$(this).scrollTop()>=95?e.text()!==t&&e.text(t):e.text()!==s&&e.text(s)}),e.click(function(){$("body,html").animate({scrollTop:0},800)})}),$(function(){const e=$(".collapse");e.on("hide.bs.collapse",function(){const e="h_"+$(this).attr("id").substring("l_".length);e&&($(`#${e} .far.fa-folder-open`).attr("class","far fa-folder fa-fw"),$(`#${e} i.fas`).addClass("rotate"),$(`#${e}`).removeClass("hide-border-bottom"))}),e.on("show.bs.collapse",function(){const e="h_"+$(this).attr("id").substring("l_".length);e&&($(`#${e} .far.fa-folder`).attr("class","far fa-folder-open fa-fw"),$(`#${e} i.fas`).removeClass("rotate"),$(`#${e}`).addClass("hide-border-bottom"))})});
\ No newline at end of file
diff --git a/assets/js/dist/home.min.js b/assets/js/dist/home.min.js
index dad56ca85..efd5ca118 100644
--- a/assets/js/dist/home.min.js
+++ b/assets/js/dist/home.min.js
@@ -1 +1,6 @@
+/*!
+ * Chirpy v2.7.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * © 2021 Cotes Chung
+ * MIT Licensed
+ */
 function copyLink(e){e&&0!==e.length||(e=window.location.href);const t=$("<input>");$("body").append(t),t.val(e).select(),document.execCommand("copy"),t.remove(),alert("Link copied successfully!")}$(function(){$(window).scroll(()=>{$(this).scrollTop()>50&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$("input[type=checkbox]").addClass("unloaded"),$("input[type=checkbox][checked]").before('<i class="fas fa-check-circle checked"></i>'),$("input[type=checkbox]:not([checked])").before('<i class="far fa-circle"></i>')}),$(function(){const e=$("#sidebar-trigger"),t=$("#search-trigger"),o=$("#search-cancel"),a=$("#search-cleaner"),s=$("#main"),n=$("#topbar-title"),l=$("#search-wrapper"),i=$("#search-result-wrapper"),r=$("#search-results"),c=$("#search-input"),d=$("#search-hints"),u=function(){let e=0;return{block(){e=$(window).scrollTop()},release(){$("html,body").scrollTop(e)},getOffset:()=>e}}(),h={on(){e.addClass("unloaded"),n.addClass("unloaded"),t.addClass("unloaded"),l.addClass("d-flex"),o.addClass("loaded")},off(){o.removeClass("loaded"),l.removeClass("d-flex"),e.removeClass("unloaded"),n.removeClass("unloaded"),t.removeClass("unloaded")}},f=function(){let e=!1;return{on(){e||(i.removeClass("unloaded"),s.addClass("hidden"),e=!0,u.block())},off(){e&&(r.empty(),d.hasClass("unloaded")&&d.removeClass("unloaded"),i.addClass("unloaded"),a.removeClass("visible"),s.removeClass("hidden"),c.val(""),e=!1,u.release())},isVisible:()=>e}}();function p(){return o.hasClass("loaded")}t.click(function(){h.on(),f.on(),c.focus()}),o.click(function(){h.off(),f.off()}),c.focus(function(){l.addClass("input-focus")}),c.focusout(function(){l.removeClass("input-focus")}),c.on("keyup",function(e){8===e.keyCode&&""===c.val()?p()?d.removeClass("unloaded"):f.off():""!==c.val()&&(f.on(),a.hasClass("visible")||a.addClass("visible"),p()&&d.addClass("unloaded"))}),a.on("click",function(){c.val(""),p()?(d.removeClass("unloaded"),r.empty()):f.off(),c.focus(),a.removeClass("visible")})}),$(function(){const e=function(){let e=!1;const t=$("body");return{toggle(){!1===e?t.attr("sidebar-display",""):t.removeAttr("sidebar-display"),e=!e}}}();$("#sidebar-trigger").click(e.toggle),$("#mask").click(e.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const e=$("#topbar-wrapper"),t=$("#toc-wrapper"),o=$(".access"),a=$("#search-input");let s,n=0;const l=5,i=e.outerHeight();$(window).scroll(function(e){$("#topbar-title").is(":hidden")&&(s=!0)}),setInterval(function(){s&&(!function(){var s=$(this).scrollTop();Math.abs(n-s)<=l||(s>n&&s>i?(e.removeClass("topbar-down").addClass("topbar-up"),t.length>0&&t.removeClass("topbar-down"),o.length>0&&o.removeClass("topbar-down"),a.is(":focus")&&a.blur()):s+$(window).height()<$(document).height()&&(e.removeClass("topbar-up").addClass("topbar-down"),t.length>0&&t.addClass("topbar-down"),o.length>0&&o.addClass("topbar-down")),n=s)}(),s=!1)},250)}),$(function(){const e=$("#topbar-title"),t=$("div.post>h1"),o=e.text().trim();let a=t.length>0?t.text().trim():$("h1").text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(a)&&(a=a.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){if($("#post-list").length||t.is(":hidden")||e.is(":hidden")||$("#sidebar.sidebar-expand").length)return!1;$(this).scrollTop()>=95?e.text()!==a&&e.text(a):e.text()!==o&&e.text(o)}),e.click(function(){$("body,html").animate({scrollTop:0},800)})}),$(function(){let e=$(".timeago").length,t=void 0;function o(){return $(".timeago").each(function(){if($(this).children("i").length>0){$(this).text();let t=$(this).hasClass("lastmod"),o=$(this).children("i"),a=o.text();$(this).text(function(t,o){let a=new Date,s=new Date(t);if(s.getFullYear()!==a.getFullYear())return e-=1,s.toLocaleString("en-US",{year:"numeric",month:"short",day:"numeric"});if(s.getMonth()!==a.getMonth())return e-=1,s.toLocaleString("en-US",{month:"short",day:"numeric"});let n=Math.floor((a-s)/1e3),l=Math.floor(n/86400);if(l>=1)return e-=1,l+" day"+(l>1?"s":"")+" ago";let i=Math.floor(n/3600);if(i>=1)return i+" hour"+(i>1?"s":"")+" ago";let r=Math.floor(n/60);return r>=1?r+" minute"+(r>1?"s":"")+" ago":(o?"just":"Just")+" now"}(a,t)),$(this).append(o)}}),0===e&&void 0!==t&&clearInterval(t),e}0!==e&&o()>0&&(t=setInterval(o,6e4))});
\ No newline at end of file
diff --git a/assets/js/dist/page.min.js b/assets/js/dist/page.min.js
index 5e8724d51..d61d6ea8d 100644
--- a/assets/js/dist/page.min.js
+++ b/assets/js/dist/page.min.js
@@ -1 +1,6 @@
+/*!
+ * Chirpy v2.7.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * © 2021 Cotes Chung
+ * MIT Licensed
+ */
 function copyLink(e){e&&0!==e.length||(e=window.location.href);const t=$("<input>");$("body").append(t),t.val(e).select(),document.execCommand("copy"),t.remove(),alert("Link copied successfully!")}$(function(){$(window).scroll(()=>{$(this).scrollTop()>50&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$("input[type=checkbox]").addClass("unloaded"),$("input[type=checkbox][checked]").before('<i class="fas fa-check-circle checked"></i>'),$("input[type=checkbox]:not([checked])").before('<i class="far fa-circle"></i>')}),$(function(){const e=$("#sidebar-trigger"),t=$("#search-trigger"),o=$("#search-cancel"),s=$("#search-cleaner"),a=$("#main"),l=$("#topbar-title"),n=$("#search-wrapper"),c=$("#search-result-wrapper"),r=$("#search-results"),i=$("#search-input"),d=$("#search-hints"),u=function(){let e=0;return{block(){e=$(window).scrollTop()},release(){$("html,body").scrollTop(e)},getOffset:()=>e}}(),f={on(){e.addClass("unloaded"),l.addClass("unloaded"),t.addClass("unloaded"),n.addClass("d-flex"),o.addClass("loaded")},off(){o.removeClass("loaded"),n.removeClass("d-flex"),e.removeClass("unloaded"),l.removeClass("unloaded"),t.removeClass("unloaded")}},p=function(){let e=!1;return{on(){e||(c.removeClass("unloaded"),a.addClass("hidden"),e=!0,u.block())},off(){e&&(r.empty(),d.hasClass("unloaded")&&d.removeClass("unloaded"),c.addClass("unloaded"),s.removeClass("visible"),a.removeClass("hidden"),i.val(""),e=!1,u.release())},isVisible:()=>e}}();function h(){return o.hasClass("loaded")}t.click(function(){f.on(),p.on(),i.focus()}),o.click(function(){f.off(),p.off()}),i.focus(function(){n.addClass("input-focus")}),i.focusout(function(){n.removeClass("input-focus")}),i.on("keyup",function(e){8===e.keyCode&&""===i.val()?h()?d.removeClass("unloaded"):p.off():""!==i.val()&&(p.on(),s.hasClass("visible")||s.addClass("visible"),h()&&d.addClass("unloaded"))}),s.on("click",function(){i.val(""),h()?(d.removeClass("unloaded"),r.empty()):p.off(),i.focus(),s.removeClass("visible")})}),$(function(){const e=function(){let e=!1;const t=$("body");return{toggle(){!1===e?t.attr("sidebar-display",""):t.removeAttr("sidebar-display"),e=!e}}}();$("#sidebar-trigger").click(e.toggle),$("#mask").click(e.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const e=$("#topbar-wrapper"),t=$("#toc-wrapper"),o=$(".access"),s=$("#search-input");let a,l=0;const n=5,c=e.outerHeight();$(window).scroll(function(e){$("#topbar-title").is(":hidden")&&(a=!0)}),setInterval(function(){a&&(!function(){var a=$(this).scrollTop();Math.abs(l-a)<=n||(a>l&&a>c?(e.removeClass("topbar-down").addClass("topbar-up"),t.length>0&&t.removeClass("topbar-down"),o.length>0&&o.removeClass("topbar-down"),s.is(":focus")&&s.blur()):a+$(window).height()<$(document).height()&&(e.removeClass("topbar-up").addClass("topbar-down"),t.length>0&&t.addClass("topbar-down"),o.length>0&&o.addClass("topbar-down")),l=a)}(),a=!1)},250)}),$(function(){const e=$("#topbar-title"),t=$("div.post>h1"),o=e.text().trim();let s=t.length>0?t.text().trim():$("h1").text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(s)&&(s=s.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){if($("#post-list").length||t.is(":hidden")||e.is(":hidden")||$("#sidebar.sidebar-expand").length)return!1;$(this).scrollTop()>=95?e.text()!==s&&e.text(s):e.text()!==o&&e.text(o)}),e.click(function(){$("body,html").animate({scrollTop:0},800)})}),$(function(){$("a[href*='#']").not("[href='#']").not("[href='#0']").click(function(e){if(this.pathname.replace(/^\//,"")===location.pathname.replace(/^\//,"")&&location.hostname===this.hostname){const t=16,o=decodeURI(this.hash);let s=RegExp(/^#fnref:/).test(o),a=RegExp(/^#fn:/).test(o),l=o.includes(":")?o.replace(/\:/,"\\:"):o,n=$(l);if(n.length){e.preventDefault(),history.pushState&&history.pushState(null,null,o);let l=$(this).offset().top,c=n.offset().top;const r=c<l,i=$("#topbar-wrapper").outerHeight();r&&s&&(c-=i+t/2),$("html,body").animate({scrollTop:c},800,()=>{const e=$(n);e.focus();if($("[scroll-focus=true]").length&&$("[scroll-focus=true]").attr("scroll-focus",!1),$(":target").length&&$(":target").attr("scroll-focus",!1),(a||s)&&e.attr("scroll-focus",!0),e.is(":focus"))return!1;e.attr("tabindex","-1"),e.focus()})}}})});
\ No newline at end of file
diff --git a/assets/js/dist/post.min.js b/assets/js/dist/post.min.js
index 48a1a3723..d4d714d0f 100644
--- a/assets/js/dist/post.min.js
+++ b/assets/js/dist/post.min.js
@@ -1 +1,6 @@
+/*!
+ * Chirpy v2.7.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * © 2021 Cotes Chung
+ * MIT Licensed
+ */
 function copyLink(e){e&&0!==e.length||(e=window.location.href);const t=$("<input>");$("body").append(t),t.val(e).select(),document.execCommand("copy"),t.remove(),alert("Link copied successfully!")}$(function(){$(window).scroll(()=>{$(this).scrollTop()>50&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$("input[type=checkbox]").addClass("unloaded"),$("input[type=checkbox][checked]").before('<i class="fas fa-check-circle checked"></i>'),$("input[type=checkbox]:not([checked])").before('<i class="far fa-circle"></i>')}),$(function(){const e=$("#sidebar-trigger"),t=$("#search-trigger"),o=$("#search-cancel"),s=$("#search-cleaner"),a=$("#main"),n=$("#topbar-title"),l=$("#search-wrapper"),r=$("#search-result-wrapper"),i=$("#search-results"),c=$("#search-input"),d=$("#search-hints"),u=function(){let 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l=5,r=e.outerHeight();$(window).scroll(function(e){$("#topbar-title").is(":hidden")&&(a=!0)}),setInterval(function(){a&&(!function(){var a=$(this).scrollTop();Math.abs(n-a)<=l||(a>n&&a>r?(e.removeClass("topbar-down").addClass("topbar-up"),t.length>0&&t.removeClass("topbar-down"),o.length>0&&o.removeClass("topbar-down"),s.is(":focus")&&s.blur()):a+$(window).height()<$(document).height()&&(e.removeClass("topbar-up").addClass("topbar-down"),t.length>0&&t.addClass("topbar-down"),o.length>0&&o.addClass("topbar-down")),n=a)}(),a=!1)},250)}),$(function(){const e=$("#topbar-title"),t=$("div.post>h1"),o=e.text().trim();let s=t.length>0?t.text().trim():$("h1").text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(s)&&(s=s.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){if($("#post-list").length||t.is(":hidden")||e.is(":hidden")||$("#sidebar.sidebar-expand").length)return!1;$(this).scrollTop()>=95?e.text()!==s&&e.text(s):e.text()!==o&&e.text(o)}),e.click(function(){$("body,html").animate({scrollTop:0},800)})}),$(function(){let e=$(".timeago").length,t=void 0;function o(){return $(".timeago").each(function(){if($(this).children("i").length>0){$(this).text();let t=$(this).hasClass("lastmod"),o=$(this).children("i"),s=o.text();$(this).text(function(t,o){let s=new Date,a=new Date(t);if(a.getFullYear()!==s.getFullYear())return e-=1,a.toLocaleString("en-US",{year:"numeric",month:"short",day:"numeric"});if(a.getMonth()!==s.getMonth())return e-=1,a.toLocaleString("en-US",{month:"short",day:"numeric"});let n=Math.floor((s-a)/1e3),l=Math.floor(n/86400);if(l>=1)return e-=1,l+" day"+(l>1?"s":"")+" ago";let r=Math.floor(n/3600);if(r>=1)return r+" hour"+(r>1?"s":"")+" ago";let i=Math.floor(n/60);return i>=1?i+" minute"+(i>1?"s":"")+" ago":(o?"just":"Just")+" now"}(s,t)),$(this).append(o)}}),0===e&&void 0!==t&&clearInterval(t),e}0!==e&&o()>0&&(t=setInterval(o,6e4))}),$(function(){$("a:has(img)").addClass("img-hyperlink")}),$(function(){const e=new RegExp("^language-([a-z])+$");$("div[class^=language-").each(function(){$(this).attr("class").split(" ").forEach(t=>{if(e.test(t)){let e=t.substring("language-".length);$(this).attr("lang",`${e}`)}})})}),$(function(){$("a[href*='#']").not("[href='#']").not("[href='#0']").click(function(e){if(this.pathname.replace(/^\//,"")===location.pathname.replace(/^\//,"")&&location.hostname===this.hostname){const t=16,o=decodeURI(this.hash);let s=RegExp(/^#fnref:/).test(o),a=RegExp(/^#fn:/).test(o),n=o.includes(":")?o.replace(/\:/,"\\:"):o,l=$(n);if(l.length){e.preventDefault(),history.pushState&&history.pushState(null,null,o);let n=$(this).offset().top,r=l.offset().top;const i=r<n,c=$("#topbar-wrapper").outerHeight();i&&s&&(r-=c+t/2),$("html,body").animate({scrollTop:r},800,()=>{const e=$(l);e.focus();if($("[scroll-focus=true]").length&&$("[scroll-focus=true]").attr("scroll-focus",!1),$(":target").length&&$(":target").attr("scroll-focus",!1),(a||s)&&e.attr("scroll-focus",!0),e.is(":focus"))return!1;e.attr("tabindex","-1"),e.focus()})}}})});
\ No newline at end of file
diff --git a/assets/js/dist/pvreport.min.js b/assets/js/dist/pvreport.min.js
index 97d7861f2..513519267 100644
--- a/assets/js/dist/pvreport.min.js
+++ b/assets/js/dist/pvreport.min.js
@@ -1 +1,6 @@
+/*!
+ * Chirpy v2.7.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * © 2021 Cotes Chung
+ * MIT Licensed
+ */
 const getInitStatus=function(){let e=!1;return()=>{let t=e;return e||(e=!0),t}}(),PvOpts={isEnabled:()=>"true"===$("meta[name=pv-cache-enabled]").attr("content"),getProxyEndpoint:()=>$("meta[name=pv-proxy-endpoint]").attr("content"),getLocalData:()=>$("meta[name=pv-cache-data]").attr("content")},PvCache=function(){const e="origin",t="proxy";function a(e){return localStorage.getItem(e)}function n(e,t){localStorage.setItem(e,t)}return{getData:()=>JSON.parse(localStorage.getItem("pv")),saveOriginCache(t){n("pv",t),n("pv_source",e),n("pv_created_date",(new Date).toJSON())},saveProxyCache(e){n("pv",e),n("pv_source",t),n("pv_created_date",(new Date).toJSON())},isFromOrigin:()=>a("pv_source")===e,isFromProxy:()=>a("pv_source")===t,isExpired(){if(PvCache.isFromOrigin()){let e=new Date(a("pv_created_date"));return e.setDate(e.getDate()+1),Date.now()>=e.getTime()}if(PvCache.isFromProxy()){let e=new Date(a("pv_created_date"));return e.setHours(e.getHours()+1),Date.now()>=e.getTime()}return!1},getAllPageviews:()=>PvCache.getData().totalsForAllResults["ga:pageviews"],newerThan:e=>PvCache.getAllPageviews()>e.totalsForAllResults["ga:pageviews"],inspectKeys(){null!==localStorage.getItem("pv")&&null!==localStorage.getItem("pv_source")&&null!==localStorage.getItem("pv_created_date")||localStorage.clear()}}}();function countUp(e,t,a){if(e<t){let n=new CountUp(a,e,t);n.error?console.error(n.error):n.start()}}function countPV(e,t){let a=0;if(void 0!==t)for(let n=0;n<t.length;++n){if(t[parseInt(n,10)][0]===e){a+=parseInt(t[parseInt(n,10)][1],10);break}}return a}function tacklePV(e,t,a,n){let r=countPV(t,e);if(r=0===r?1:r,n){const e=parseInt(a.text().replace(/,/g,""),10);r>e&&countUp(e,r,a.attr("id"))}else a.text((new Intl.NumberFormat).format(r))}function displayPageviews(e){if(void 0===e)return;let t=getInitStatus();const a=e.rows;if($("#post-list").length>0)$(".post-preview").each(function(){const e=$(this).find("a").attr("href");tacklePV(a,e,$(this).find(".pageviews"),t)});else if($(".post").length>0){const e=window.location.pathname;tacklePV(a,e,$("#pv"),t)}}function fetchProxyPageviews(){$.ajax({type:"GET",url:PvOpts.getProxyEndpoint(),dataType:"jsonp",jsonpCallback:"displayPageviews",success:(e,t,a)=>{PvCache.saveProxyCache(JSON.stringify(e))},error:(e,t,a)=>{console.log("Failed to load pageviews from proxy server: "+a)}})}function fetchPageviews(e=!0,t=!1){PvOpts.isEnabled()&&e?fetch(PvOpts.getLocalData()).then(e=>e.json()).then(e=>{t&&PvCache.newerThan(e)||(displayPageviews(e),PvCache.saveOriginCache(JSON.stringify(e)))}).then(()=>fetchProxyPageviews()):fetchProxyPageviews()}$(function(){if($(".pageviews").length>0){PvCache.inspectKeys();let e=PvCache.getData();e?(displayPageviews(e),PvCache.isExpired()?fetchPageviews(!0,PvCache.isFromProxy()):PvCache.isFromOrigin()&&fetchPageviews(!1)):fetchPageviews()}});
\ No newline at end of file
diff --git a/feed.xml b/feed.xml
index 04c4dfc25..d75e8fb8e 100644
--- a/feed.xml
+++ b/feed.xml
@@ -1,10 +1,6 @@
 ---
 layout: compress
 # Atom Feed, reference: https://validator.w3.org/feed/docs/atom.html
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# MIT License
 ---
 
 {% capture source %}
diff --git a/gulpfile.js/tasks/js.js b/gulpfile.js/tasks/js.js
index 16260a4c6..d6176539c 100644
--- a/gulpfile.js/tasks/js.js
+++ b/gulpfile.js/tasks/js.js
@@ -7,9 +7,12 @@ const { src, dest, watch, series, parallel} = require('gulp');
 const concat = require('gulp-concat');
 const rename = require("gulp-rename");
 const uglify = require('gulp-uglify');
+const insert = require('gulp-insert');
+const fs = require('fs');
 
 const JS_ROOT = './assets/js';
 const jsDest = `${ JS_ROOT }/dist/`;
+const copyrightPath = `${ JS_ROOT }/.copyright`;
 
 function concatJs(files, output) {
   return src(files)
@@ -20,7 +23,8 @@ function concatJs(files, output) {
 
 function minifyJs() {
   return src(`${ jsDest }/*.js`)
-    .pipe(uglify())
+    .pipe(insert.prepend(fs.readFileSync(copyrightPath, 'utf8')))
+    .pipe(uglify({output: {comments: /^!|@preserve|@license|@cc_on/i}}))
     .pipe(dest(jsDest));
 }
 
@@ -63,10 +67,7 @@ const pageJs = () => {
 
 // GA pageviews report
 const pvreportJs = () => {
-  return concatJs([
-      `${JS_ROOT}/_utils/pageviews.js`
-    ], 'pvreport'
-  );
+  return concatJs(`${JS_ROOT}/_utils/pageviews.js`, 'pvreport');
 };
 
 const buildJs = parallel(homeJs, postJs, categoriesJs, pageJs, pvreportJs);
@@ -78,7 +79,8 @@ exports.liveRebuild = () => {
 
   watch([
       `${ JS_ROOT }/_commons/*.js`,
-      `${ JS_ROOT }/_utils/*.js`
+      `${ JS_ROOT }/_utils/*.js`,
+      `${ JS_ROOT }/lib/*.js`
     ],
     buildJs
   )
diff --git a/index.html b/index.html
index 0b95cc9c5..1357b0809 100644
--- a/index.html
+++ b/index.html
@@ -1,9 +1,4 @@
 ---
 layout: home
-
 # Index page
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 ---
diff --git a/package.json b/package.json
index d84babc3b..7e1750b03 100644
--- a/package.json
+++ b/package.json
@@ -20,10 +20,11 @@
   },
   "homepage": "https://github.com/cotes2020/jekyll-theme-chirpy#readme",
   "dependencies": {
-    "uglify-js": "git+https://github.com/mishoo/UglifyJS2.git#harmony",
     "gulp": "^4.0.2",
     "gulp-concat": "^2.6.1",
+    "gulp-insert": "^0.5.0",
     "gulp-rename": "^2.0.0",
-    "gulp-uglify": "^3.0.2"
+    "gulp-uglify": "^3.0.2",
+    "uglify-js": "git+https://github.com/mishoo/UglifyJS2.git#harmony"
   }
 }
diff --git a/robots.txt b/robots.txt
index 997ca7cce..681b4c624 100644
--- a/robots.txt
+++ b/robots.txt
@@ -1,11 +1,6 @@
 ---
-# The robots rules
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
-layout: null
 permalink: robots.txt
+# The robots rules
 ---
 
 User-agent: *
diff --git a/sw.js b/sw.js
index 542852e35..dee9898a7 100644
--- a/sw.js
+++ b/sw.js
@@ -1,10 +1,6 @@
 ---
 layout: compress
-
-# Chirpy v2.2
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2020 Cotes Chung
-# MIT Licensed
+# PWA service worker
 ---
 
 self.importScripts('{{ "/assets/js/data/cache-list.js" | relative_url }}');
diff --git a/tools/bump-version.sh b/tools/bump-version.sh
deleted file mode 100755
index 93e86d1fe..000000000
--- a/tools/bump-version.sh
+++ /dev/null
@@ -1,53 +0,0 @@
-#!/usr/bin/env bash
-#
-# Bump latest version to file `_data/meta.yml`
-#
-# v2.5.1
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2020 Cotes Chung
-# Published under MIT License
-
-set -eu
-
-META_FILE="_data/meta.yml"
-
-bump() {
-  _version_field="version: $1"
-
-  if [[ ! -f $META_FILE ]]; then
-    echo "name: Chirpy" > $META_FILE
-    echo "$_version_field" >> $META_FILE
-    echo "homepage: https://github.com/cotes2020/jekyll-theme-chirpy/" >> $META_FILE
-  else
-    sed -i "s/^version:.*/$_version_field/g" $META_FILE
-  fi
-
-  if [[ -n $(git status $META_FILE -s) ]]; then
-    git add $META_FILE
-    git commit -m "Bump version to $1"
-  fi
-}
-
-_latest_tag="$(git describe --tags --abbrev=0)"
-
-echo "Input a version number (hint: latest version is ${_latest_tag:1})"
-
-read version
-
-if [[ $version =~ ^[[:digit:]]+\.[[:digit:]]+(\.[[:digit:]]+)?$ ]]; then
-
-  if git tag --list | egrep -q "^v$version$"; then
-    echo "Error: version '$version' already exists"
-    exit -1
-  fi
-
-  echo "Bump version to $version"
-  bump "$version"
-
-  echo "Create tag v$version"
-  git tag "v$version"
-
-else
-
-  echo "Error: Illegal version number: '$version'"
-fi
diff --git a/tools/bump.sh b/tools/bump.sh
new file mode 100755
index 000000000..9c6c5b241
--- /dev/null
+++ b/tools/bump.sh
@@ -0,0 +1,75 @@
+#!/usr/bin/env bash
+#
+# Bump latest version to
+#   - _sass/jekyll-theme-chirpy.scss
+#   - assets/js/_commons/_copyright.js
+#   - assets/js/dist/*.js
+#   - jekyll-theme-chirpy.gemspec
+#
+# Required: gulp
+
+set -eu
+
+ASSETS=(
+  "_sass/jekyll-theme-chirpy.scss"
+  "assets/js/.copyright"
+)
+
+GEM_SPEC="jekyll-theme-chirpy.gemspec"
+
+bump_assets() {
+  _version="$1"
+  for i in ${!ASSETS[@]}; do
+    sed -i "s/v[[:digit:]]\.[[:digit:]]\.[[:digit:]]/v$_version/" ${ASSETS[$i]}
+  done
+
+  gulp
+}
+
+bump_gemspec() {
+  _version="$1"
+  sed -i "s/[[:digit:]]\.[[:digit:]]\.[[:digit:]]/$_version/" $GEM_SPEC
+}
+
+bump() {
+  bump_assets $1
+  bump_gemspec $1
+
+  if [[ -n $(git status . -s) ]]; then
+    git add .
+    git commit -m "Bump version to $1"
+  fi
+}
+
+main() {
+  if [[ -n $(git status . -s) ]]; then
+    echo "Warning: commit unstaged files first, and then run this tool againt."
+    exit -1
+  fi
+
+  _latest_tag="$(git describe --tags --abbrev=0)"
+
+  echo "Input a version number (hint: latest version is ${_latest_tag:1})"
+
+  read _version
+
+  if [[ $_version =~ ^[[:digit:]]+\.[[:digit:]]+\.[[:digit:]]$ ]]; then
+
+    if git tag --list | egrep -q "^v$_version$"; then
+      echo "Error: version '$_version' already exists"
+      exit -1
+    fi
+
+    echo "Bump version to $_version"
+    bump "$_version"
+
+    echo "Create tag v$_version"
+    git tag "v$_version"
+
+  else
+
+    echo "Error: Illegal version number: '$_version'"
+  fi
+}
+
+main
diff --git a/tools/deploy.sh b/tools/deploy.sh
index 0a6353dc1..7a93e73e4 100755
--- a/tools/deploy.sh
+++ b/tools/deploy.sh
@@ -1,11 +1,6 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Deploy the content of _site to 'origin/<pages_branch>'
-#
-# v2.5
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2020 Cotes Chung
-# Published under MIT License
 
 set -eu
 
diff --git a/tools/init.sh b/tools/init.sh
index 51393dd5e..2ab78df82 100755
--- a/tools/init.sh
+++ b/tools/init.sh
@@ -1,11 +1,6 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Init the evrionment for new user.
-#
-# v2.5
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2020 Cotes Chung
-# Published under MIT License
 
 set -eu
 
diff --git a/tools/pv.sh b/tools/pv.sh
index e26ba10d2..c0064e1dd 100755
--- a/tools/pv.sh
+++ b/tools/pv.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Fetch Google Analytics Pageviews reporting cache
 # and save as 'assets/data/pagevies.json'
@@ -6,12 +6,6 @@
 # Requirement:
 #   - jq
 #   - wget
-#
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# MIT Licensed
-
 
 set -eu
 
diff --git a/tools/run.sh b/tools/run.sh
index 7bc287727..8072e4148 100755
--- a/tools/run.sh
+++ b/tools/run.sh
@@ -1,11 +1,5 @@
 #!/usr/bin/env bash
 #
 # Run jekyll serve and then launch the site
-#
-# v2.6.1
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2020 Cotes Chung
-# MIT Licensed
 
 bundle exec jekyll s -H 0.0.0.0 -l
-
diff --git a/tools/test.sh b/tools/test.sh
index 87da0bef0..0a22ba016 100755
--- a/tools/test.sh
+++ b/tools/test.sh
@@ -1,15 +1,10 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Using HTML-proofer to test site.
 #
 # Requirement: https://github.com/gjtorikian/html-proofer
 #
 # Usage: bash /path/to/test.sh [indicated path]
-#
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2020 Cotes Chung
-# MIT Licensed
 
 DEST=_site
 URL_IGNORE=cdn.jsdelivr.net